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71GA
  • Member for 10 years, 7 months
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18 votes
3 answers
4k views

Meaning of inner product $\langle \vec{r} | \psi(t)\rangle $

8 votes
2 answers
2k views

Connection between $\Delta x \Delta p \geq \frac{\hbar}{2}$ and $\Delta E \Delta t \geq \frac{\hbar}{2}$

7 votes
4 answers
6k views

Minkowski diagram and length contraction

7 votes
1 answer
5k views

Minkowski diagram, hyperbola and invariant quantity of relativity

7 votes
5 answers
11k views

Relativistic momentum

7 votes
2 answers
18k views

Deriving group velocity

6 votes
2 answers
2k views

Amplitude of Probability amplitude. Which one is it?

6 votes
3 answers
1k views

Probability and probability amplitude

6 votes
1 answer
7k views

Connecting 4-velocity to equation for adding velocities

6 votes
2 answers
4k views

Plotting $\psi$ for finite square well potential

6 votes
2 answers
4k views

Proof for commutator relation $[\hat{H},\hat{a}] = - \hbar \omega \hat{a}$

5 votes
1 answer
489 views

Observables - what are they?

5 votes
2 answers
22k views

Energies and numbers of bound states in finite potential well

5 votes
2 answers
2k views

Kinetic energy of a photon and Schwarzschild radius

5 votes
3 answers
27k views

How to get "complex exponential" form of wave equation out of "sinusoidal form"?

5 votes
3 answers
9k views

Finite potential well problem - calculating the ground state

4 votes
2 answers
2k views

Wavefunction as a combination of two stationary states - how to find those states?

4 votes
2 answers
12k views

Calculating the expectation value for kinetic energy $\langle E_k \rangle$ for a known wave function

4 votes
2 answers
761 views

QM formalism is one big confusion - lack of geometrical explaination with images

4 votes
2 answers
1k views

Heisenberg uncertainty principle derivation - unexplained factor of $4 \sigma_k^2$ in Gaussian

4 votes
1 answer
2k views

Finite, square, potential well

4 votes
2 answers
7k views

Pair production - mathematically?

3 votes
1 answer
840 views

Derivation of the Lorentz transformation

3 votes
1 answer
270 views

Tunneling and transmission

3 votes
1 answer
6k views

Gaussian wave packet

3 votes
1 answer
8k views

Schrödinger equation for a harmonic oscillator

2 votes
2 answers
4k views

How do we know that $\psi$ is the eigenfunction of an operator $\hat{H}$ with eigenvalue $W$?

2 votes
1 answer
2k views

Some Dirac notation explanations

2 votes
2 answers
2k views

Vector $\vec{z}$ and its conjugate transpose $\overline{\vec{v}^\top}$ - is it the same as $\left|z\right\rangle$ and $\left\langle z \right|$

2 votes
1 answer
386 views

Compton scatering problem - How to solve this large problem faster using the momentum system?